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MCC's or Motor Control Centersare an assembly of one section or more that contain a common power bus. These have been utilized in the automobile industry since the 1950's, because they were used lots of electric motors. These days, they are utilized in different commercial and industrial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This particular machinery can comprise metering, variable frequency drives and programmable controllers. The MCC's are usually seen in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are made for big motors that vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
In areas where really corrosive or dusty processes are occurring, the motor control center may be installed in a separate air-conditioned room. Normally the MCC will be positioned on the factory floor adjacent to the machines it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers can be unplugged from the cabinet to be able to complete maintenance or testing, whereas really big controllers could be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays In order to protect the motor, circuit breaker or fuses so as to provide short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers offer wire ways for field control and power cables.
Every motor controller within a motor control center could be specified with various options. These choices comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of bi-metal and solid-state overload protection relays. They also have different classes of kinds of circuit breakers and power fuses.
Regarding the delivery of motor control centers, there are various alternatives for the client. These can be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they can be supplied ready for the customer to connect all field wiring.
Motor control centers usually sit on the floor and should have a fire-resistance rating. Fire stops can be needed for cables that go through fire-rated floors and walls.
